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yeoreum.yun@arm.com, netdev@vger.kernel.org, matthew.brost@intel.com, her0gyugyu@gmail.com Subject: [PATCH v16 08/42] x86_64, dept: add support CONFIG_ARCH_HAS_DEPT_SUPPORT to x86_64 Date: Mon, 19 May 2025 18:17:52 +0900 Message-Id: <20250519091826.19752-9-byungchul@sk.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20250519091826.19752-1-byungchul@sk.com> References: <20250519091826.19752-1-byungchul@sk.com> X-Brightmail-Tracker: H4sIAAAAAAAAAzWSb0xTZxSH97739t7bSpebSuadLNvSxFRrhkLEnMw5TUzmm0zjEk00Ev80 cmObQTFFUEgWYVCtIuhMABVhBbFWKIKtJk4pKSWWgRlUqaUgVmXE2EklA1pWQVyr8cvJk/x+ 5zlfDkcpPJKlnE5/WDToNdlKRkbLwkkN3+hn1drVs11KiMyYaLjUZmPAe70Fge1mCYbQvc0w FJ1AMPfXAAU1VV4EDc+fUHDTE0TgtP7KwOD4p+CLTDLQW1XOQOnlNgYevJrHMFp9DkOLfSs8 tbyg4f7ZRgw1IQZqa0pxfLzEELM0s2ApXgZj1osszD9Pg96gXwLOkZVwoX6UgQ5nLw2e22MY Bu9cYiBoeyeB+54/aYhWpoD3twoJtL5uZOBV1EKBJTLJwkOXGYPH/Bm0l8WFx6cXJNBT4cJw vOkGBt/wXQSdpmcY7DY/A92RCQwOexUFb67eQzBWGWbBeDrGQm1JJYJyYzUNZaMZMPdf/HLd 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X-HE-Meta: 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 wR+81fVN 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Roughly, system call and user oriented fault are the cases. Make dept aware of the entrances of x86_64 and add support CONFIG_ARCH_HAS_DEPT_SUPPORT to x86_64. Signed-off-by: Byungchul Park --- arch/x86/Kconfig | 1 + arch/x86/entry/syscall_64.c | 7 +++++++ arch/x86/mm/fault.c | 7 +++++++ 3 files changed, 15 insertions(+) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 5873c9e39919..4b6d9e59d96c 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -38,6 +38,7 @@ config X86_64 select ARCH_HAS_ELFCORE_COMPAT select ZONE_DMA32 select EXECMEM if DYNAMIC_FTRACE + select ARCH_HAS_DEPT_SUPPORT config FORCE_DYNAMIC_FTRACE def_bool y diff --git a/arch/x86/entry/syscall_64.c b/arch/x86/entry/syscall_64.c index b6e68ea98b83..66bd5af5aff1 100644 --- a/arch/x86/entry/syscall_64.c +++ b/arch/x86/entry/syscall_64.c @@ -8,6 +8,7 @@ #include #include #include +#include #define __SYSCALL(nr, sym) extern long __x64_##sym(const struct pt_regs *); #define __SYSCALL_NORETURN(nr, sym) extern long __noreturn __x64_##sym(const struct pt_regs *); @@ -86,6 +87,12 @@ static __always_inline bool do_syscall_x32(struct pt_regs *regs, int nr) /* Returns true to return using SYSRET, or false to use IRET */ __visible noinstr bool do_syscall_64(struct pt_regs *regs, int nr) { + /* + * This is a system call from user mode. Make dept work with a + * new kernel mode context. + */ + dept_update_cxt(); + add_random_kstack_offset(); nr = syscall_enter_from_user_mode(regs, nr); diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c index 296d294142c8..241537ce47fe 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -20,6 +20,7 @@ #include #include /* find_and_lock_vma() */ #include +#include #include /* boot_cpu_has, ... */ #include /* dotraplinkage, ... */ @@ -1220,6 +1221,12 @@ void do_user_addr_fault(struct pt_regs *regs, tsk = current; mm = tsk->mm; + /* + * This fault comes from user mode. Make dept work with a new + * kernel mode context. + */ + dept_update_cxt(); + if (unlikely((error_code & (X86_PF_USER | X86_PF_INSTR)) == X86_PF_INSTR)) { /* * Whoops, this is kernel mode code trying to execute from -- 2.17.1